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a full 3 hours 3 hours a eight hours a night Kangaroos sleep ( )hours a day. I cleaned my classroom(A with three hours Bthree hours ago C in three hours D three hours before)如上 I surf the internet 3 hours a day 句子可以吗?I surf the internet 3 hours a day / 3 hours every day / 3 hours per day.我写的这个句子 表达行么?3hours 前面不加 for.是否都行 因为记得是完成时态,一般才用 for,这里一 two and a half hours 有什么相同的句子?我知道一句“two hours and a half” 还想找3、4句 a half hour还是a haif hours A child slpees for eight hours a -- How far is it from here to Huangshan Mountain?---________.A. 3 hours’ rideB. 3 hours您好!如何选择?理由?谢谢! Yes 3 hours什么意思 The day made him work for 12 hours a day~3Q3Q3Q3Q主动该被动 The trip ____ about 3 hours from the school to the park.A.cost B.took The supermarket _________for 3 hours.选择：A.has openedB.has been open i think i drive the tractor 3 hours a week 什么意思? one and a half hours 还是hour One and a half______a.hour b.hours It sleeps for 11 hours a